#include <fstream>

std::ofstream out("text.out");
std::ifstream in("text.in");

int main()
{
    char c;
    int s = 0, n = 0, sw = 0;

    while(in.get(c)){
        if (std::isalpha(c)){
            s++;
            if(sw == 0){
                n++;
                sw = 1;
            }
        }
        else
            sw = 0;
    }
    out << s/n;
    return 0;
}